<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style>
    
  </style>
</head>
<body>
  
</body>
<script>

  // alert( 1 + 1 );

  // document.write( 2 + 2 );

  // console.log( 3 + 3 );

  // console.log( "hello" );
  

  // alert( "<b>1</b>", 2 )
  // document.write( 1, "&nbsp;&nbsp;<br>&nbsp;&nbsp;", 2 )
  // console.log(1, "<b>2</b>", 3)


  // 数据类型

  // alert( {} );

  // document.write( {} );

  // console.log( {} );



</script>
</html>